Kurohyou 2 features a song which Ukyo can sing in the karaoke mini-game titled "Majima no MajiROCK", which features the voice of Goro Majima and his character profile on the song cover. Goro Majima is a character from the first Yakuza game who has appeared in every single mainline title since, but never made an appearance in either of the Kurohyou spin-offs besides this cameo, implying that he had to have recorded this song himself at some point.